Although over 190 different species of bird have been seen on or around the central islands of Seychelles (and the number is increasing all the time), many of these are occasional visitors or vagrants while others, including all of the shore birds are migrants; they come here every year but do not breed here. Only 38 bird species breed here, and of these nine were introduced. Species that arrived in Seychelles with no help from man, and breed here, are called native species.